When juicing fruits and vegies a lot of "solid" pulp are left over. I was wondering if they contain significant nutrients that might be better eaten instead of drinking pure juice?
A good juicer gets a fair amount of skin, though how much nutrition is lost would depend a lot on the juicer. But it's not just about nutrients, it's about fiber. Fiber serves many purposes, including slowing the absorption of those nutrients and sugars (less insulin spike), and fiber is something the body needs.
I don't see anything wrong with juicing, and it's tasty. But IMO it shouldn't be the sole source of fruit and vegetable consumption, because you're missing a lot of what they have to offer, in terms of both nutrients and fiber.
All this said, not really a fitness question.